Annual forage sorghum

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1 Annual forage sorghum Scientific name(s) Sorghum spp. annual forage hybrids Sorghum vulgare sweet sorghum Sorghum spp. hybrid sweet sudan grass hybrids Strengths Easy to establish Highly productive Good regrowth potential Provides standover forage in winter Can be grown in dryland and irrigated situations Can be used for grazing, hay &/or silage Limitations Requires high fertility soils Requires good soil water or irrigation for maximum production Requires appropriate grazing management to obtain maximum potential Prussic acid poisoning though the potential is low in normal seasons Varietal selection must be made carefully, depending on the final use e.g. for grazing, hay production, pit silage or round bale silage Plant description Plant: vigorously-growing, erect, annuals with branched tillers reaching 2-3 m in height. Stems: erect to 2-3 m. Leaves: cm wide. Seedhead: large pyramidal panicles with secondary and tertiary branches. Seeds: oval to round; size varies with cultivar between 30,000-75,000 seeds/kg. Pasture type and use Various species and their hybrids are grown as forage for livestock production or for hay or silage conservation. Coarse-stemmed varieties are not suitable for round bale silage production. The various types of hybrids have different agronomic features and uses. Sudan grass and Sudan x Sudan hybrids Grazing, hay Suitable for repeated, heavy grazing with excellent recovery between grazing Feed quality is often higher than the Sudan grass x grain sorghum hybrids Suited to hay making because it tillers heavily and has finer stems than other sorghums Lower prussic acid levels than other forage sorghums Sorghum hybrid Limited recovery from grazing High forage yield combined with high grain content Developed specifically for the silage industry Sweet sorghum hybrids

2 Grazing, hay or silage - coarse stemmed varieties for pit silage, narrow-stemmed varieties for round bale silage. Late-flowering cultivars for standover grazing into autumn. Slow recovery from grazing (poor regrowth) Tall late flowering types with thick stems and high sugar content are most suitable for standover feed into the autumn-winter Prussic acid levels are sometimes high. However, contemporary varieties have lower levels of prussic acid than older varieties and prussic acid is usually only a concern in drought years when plants are stressed Tall early flowering types with fine stems, have lower prussic acid and can be managed for silage by allowing them to set seed but harvest them when the seeds are soft. Fine-stemmed cultivars can be used in both pit and round bale silage Mainly used for standover feed into autumn-winter, or silage Preferred planting time December to January Sweet sorghum x Sudan grass hybrids Compact and leafy with more juicy and sweet stems Grazing, hay Late-flowering cultivars for standover grazing into autumn Prussic acid levels are low Similar to sweet sorghums but with more rapid regrowth They grow rapidly but some cultivars selected for later flowering are easier to manage as they remain leafy for longer. Sorghum x Sudan grass hybrids Suitable for repeated, heavy grazing with good recovery between grazing Potential for a high dry matter yield Best grazed at around one metre in height Early maturing types require strict grazing management in order to maximise both their fodder yield and feed quality BMR sorghum x sweet sorghum Brown midrib varieties contain less lignin and have higher digestibility May be subject to lodging Graze at m as with other varieties Where it grows Rainfall Grown on stored subsoil water. Requires mm rainfall or irrigation. Poor tolerance of flooding. Soils Performs best on heavy clay soils because of their high water holding capacity. When sown on lighter soils productivity will be reduced unless adequately fertilised and good seasonal rainfall occurs. Temperature Sow when the soil temperature is above 16 o C. Establishment Companion species Grasses: It is not recommended to sow with other grasses because of its quick growth and competitive nature. Legumes: Lablab and cowpeas, though difficult to manage owing to different maturity times of the forage sorghum used and of the companion crops. Sowing/planting rates as single species Sorghum x Sudan hybrids and Sweet sorghum hybrids: 3-5 kg/ha under marginal dryland conditions 8-12 kg/ha under favourable dryland conditions kg/ha under irrigation

3 Sudan grass types: 2-8 kg/ha under dryland conditions kg/ha under irrigation Sowing/planting rates in mixtures Sorghum x Sudan hybrids and Sweet sorghum hybrids: 2-6 kg/ha under dryland conditions Sudan grass types: 2-4 kg/ha under dryland conditions in favourable environments Sowing time When soil temperatures reaches 16 o C Inoculation Not applicable Fertiliser Should be grown on fertile soils and so would need additional nitrogen on soils of lower fertility. N can be applied where adequate soil moisture is available. Management Maintenance fertliser Produces large quantities of forage and extract significant quantities of nutrients. Application of fertiliser will depend on usage. Where forage is harvested for hay or silage, fertiliser budgets should be done based on soil test and nutrient extraction, and an application of fertiliser, particularly N and K should be made to maintain feed quality and productivity. Grazing/cutting Tolerant of heavy grazing with coarse stems remaining unless grazed early. Commence grazing when plants have reached m in height. Slashing after grazing will promote even regrowth. Should not be grazed below 15 cm if good regrowth is expected. Can expect 4 or more grazings under ideal conditions. Seed production Seed of the non hybrid sudan types can be harvested. Ability to spread Low Weed potential Regenerating seedlings can be a problem in crop rotations Major pests None of signifacance Major diseases None of signifacance Herbicide susceptibility Atrazine may be used as a pre-emergence herbicide for grass and broadleaf weed control with care with some hybrids (see label recommendations) but not with sudan grass. Animal production Feeding value Nutritive value depends greatly on soil fertility or the amount of fertiliser applied, and on grazing

4 management where best results are achieved with a grazing height of m. At this height, crude protein levels could be as high as 18% with energy levels of MJ/kg DM. Palatability Moderately palatable and digestible when young. The sweet sorghum hybrids keep a higher free sugar content in the stem and are more suitable as stand-over feed into winter or the dry season. Production potential Generally, liveweight gains vary between 0.5 to 1.0 kg per head per day depending on plant height and leafiness. Livestock disorders/toxicity Leaves can be poisonous to grazing livestock due to prussic acid, especially in young stressed regrowth during a dry spell. Having supplement blocks containing sulphur available will reduce the risk of prussic acid poisoning. Nitrate poisoning can occur when grown on fertile soils containing high levels of nitrogen and when plants are stressed by dry conditions or frost. Cultivars Type Time to flower Cultivar Important characteristics Seed source/information sudan x sudan late Superdan Fine stems, many tillers Pacific Seeds late PAC Pacific Seeds sorghum x sudan late Pacific BMR Pacific Seeds ultra late Jumbo Very leafy Pacific Seeds Sweet Jumbo BettaGraze Cow Pow Everlush Very high sugar content Pacific Seeds Pioneer Pioneer Lush Bully Beef Cow Candy Zulu Grazer - N2 BMR sorghum x sweet sorghum BMR Revolution BMR Supreme BMR Choice Pacific BMR Sweet sorghum x sweet sorghum Hunnigreen Megasweet Sugargraze Sweet sorghum x sudan Sorghum x sorghum Nectar Graze n sile

5 Chopper Further information Cropping Yearbooks from the various seed companies that breed forage sorghums Acknowledgements - Author and date Brian Johnson, David Lloyd, Graeme Busby (DPI&F, Qld)

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